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Post by Greg K on Oct 24, 2022 23:39:18 GMT -6
Greetings Aurora friends:
The left turn signal light has always been wonky on my Aurora, blinking irregularly, or occasionally staying on, while the right turn signal light has been working perfectly.
Even when the four-way flasher was on, the left side light would still flash out of rhythm with the right turn light, but at least they all worked.
Today the left signal stopped working totally -- not even the green arrow in the instrument panel lights up, and neither front nor rear bulbs light up. (Maybe an occasional 'flicker', but that's about it.)
I checked the front and rear exterior bulbs; they are fine.
And when I flip the multifunction lever (turn signal switch) to signal a left turn, the clicking under the dash from the flasher/relay sounds perfect, except I have no lights anywhere, front or rear, or green arrow in instrument panel. Nothing.
Could the flasher relay be the culprit?
I really don't want to have to pull out and put in a new multifunction lever. Life's too short.
Is there a way to 'clean' the turn switch lever like we can do for the 95-99 models?
Any suggestions would be greatly appreciated, team Aurora!
Thanks so much, Greg
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Post by AuroraGirlFromMars on Oct 26, 2022 7:59:32 GMT -6
It sounds like it COULD be the flasher, but it COULD be the multifunction turn switch assembly. If You wanted to checkout that possibility, you can pull your column covers and check the wires and connector to the turn signal stalk to make sure they are still OK and stuff. also, do your fogs both front and rear, headlight, tails, stops, reverse, and high beam all work on that side? And does your other side do "switchback" on the headlight to the sidemarker in the front of the car? where the sidemarker lights up when the headlight is "off" as far as turn signals go do you have a 3.5 or a 4.0?  It appears the wheel has to come off to remove it, but the wiring harness goes further down so you should be able to inspect it without removing. I think. I have a 2001 column with the switch visible and parts off it, so I could look at that if needed |
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RCA1186
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Post by RCA1186 on Oct 26, 2022 8:32:18 GMT -6
You've already gone through and replaced the bulbs?
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Post by Greg K on Oct 26, 2022 23:39:12 GMT -6
Yes, I have tested all the front and rear turn-signal bulbs, and they are good.
The headlight, fog lamp, backup light, high beam, tail lights, all work fine on the left side. When I use the left turn signal, the flasher 'click-click-click' sounds fine, and at the same speed as a right turn signal. The green arrow for 'right' shows up, but not the green arrow for 'left'.
I'm hoping it's the flasher, because a circuit is obviously being completed when I signal left, as the flasher begins to click.
Does anyone have the part number for the flasher/relay?
I will also check the 'switchback' tomorrow; thanks for suggestion, Aurora Girl.
Greg
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Post by AuroraGirlFromMars on Oct 27, 2022 5:05:16 GMT -6
Yes, I have tested all the front and rear turn-signal bulbs, and they are good. The headlight, fog lamp, backup light, high beam, tail lights, all work fine on the left side. When I use the left turn signal, the flasher 'click-click-click' sounds fine, and at the same speed as a right turn signal. The green arrow for 'right' shows up, but not the green arrow for 'left'. I'm hoping it's the flasher, because a circuit is obviously being completed when I signal left, as the flasher begins to click. Does anyone have the part number for the flasher/relay? I will also check the 'switchback' tomorrow; thanks for suggestion, Aurora Girl. Greg If you were to pull your primary turn bulb on the right side(either one), what does it do when you signal? and then, finally, for troubleshooting, can you "lightly" hold the turn signal stalk to the left without putting it into thee detent and will it do anything? And then, if you havent already, play with your column tilt, turn the wheel, go up and down etc. Not important, but if you drive .5 mile with the left turn "on" will your DIC say "Turn signal on?" (Iirc it says that) Because the 2001 MFS switch isnt guilt free when it comes to electrical issues, but the flasher does sound like that isnt doing its job. Then again, maybe the flasher is trying to but it has a wire issue.  The T/SIG HAZ fuse in the rear fuse block supplies battery positive voltage to the flasher module. The flasher module has ground at G201. The turn signal lamps may only be activated with the ignition switch in the ON or ACCY position. The IGN-1 fuse in the rear fuse block supplies battery positive voltage to the turn signal switch. When the turn signal switch is placed in either the left or right position, current flow is from the turn signal switch assembly to the flasher module. The flasher module then sends an on-off voltage signal to either the left or right turn signals and their Instrument Cluster (IPC) indicator. When the hazard switch is pressed, all the turn signal lamps will flash including both IPC turn signal indicators. The hazard and turn signal lamp flasher assembly is grounded at G201. The left turn signals have ground at G103 and at G402. The right turn signals have ground at G401. I now have a good reason to think you should checl those grounds. Hell if I know which ones are G103 and G402, but the fact is has 2 vs the right has 1  found it "On the right side of the engine compartment, mounted in front of the underhood fuse block on the core support"
"In the lower left corner of the rear compartment, near the tail lamp pass-through" |
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Post by Greg K on Oct 27, 2022 17:53:37 GMT -6
Taylor, you are amazing. I will check all of this out. Great suggestions! Thank you so much for your generosity with your time and advice.
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Post by Greg K on Oct 27, 2022 22:20:48 GMT -6
 There's a bit of confusion in my mind, because when I look up Multi-Function Relay for my car in RockAuto, it shows me a five pin small square plastic relay, not the cigarette-pack-sized hazard/turn signal module in your illustration. In fact, I have the three-volume repair manual set from Olds/GM for 2001 Aurora, and it doesn't show me where this electrical 'relay' goes. Do you know what I mean, Aurora Girl? Or any other kind soul here? Where does this relay plug in? As always, thanks for any assistance, Greg (who has torn many dashboards apart, but finds himself befuddled) |
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Post by Greg K on Oct 28, 2022 18:52:36 GMT -6
Update. I found the actual 'flasher'. It's AC Delco 25716295. It was just above the floor, near the parking brake in my 2001. It seems fine from what I can tell. Looks like I'm going to have to figure a way, at least for starters, to 'clean' the inside of the turn signal/multifunction switch on the column.   |
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Post by AuroraGirlFromMars on Oct 31, 2022 7:16:00 GMT -6
Update. I found the actual 'flasher'. It's AC Delco 25716295. It was just above the floor, near the parking brake in my 2001. It seems fine from what I can tell. Looks like I'm going to have to figure a way, at least for starters, to 'clean' the inside of the turn signal/multifunction switch on the column. how expensive is this flasher? and also, if you can access it, then I would look at the diagram for it and see whats up. I am pretty sure the flasher. S250 is under center console, it is a splice that the left hand turn signal circuit relies on it seems. Also, I will send a diagram. The colors of the wires are immensly helpful. it looks like the flasher either completes .. grounds... or maybe sends power. its kinda confusing to me personally, but green wires between your switch on column and your flasher are vital to be ok. Your turns also go through underhood BEC(so the wiring to the center is important) There are grounds, etc etc.  |
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Post by Greg K on Oct 31, 2022 10:21:33 GMT -6
I tend to agree with you; in the service manual it says the flasher sends power to the front/rear signal lights and the little IPC indicator green arrow light. And when I flip the turn signal lever (multifunction switch) to indicate a left turn, the flasher makes its clicking noise to indicate it got power, but nothing lights up. Just as a side note, when I pulled the tilt lever and 'banged' the steering wheel up and down a few times, the left signal lights worked, but only for a minute or two, then died again, and have not worked since. So something WAS affected by steering wheel/column movement, and the turn signal switch, be it a wire or the switch itself. Gotta love the hobby  Thanks so much for your help, Aurora Girl, Greg |
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Post by Greg K on Oct 31, 2022 12:17:24 GMT -6
One useful bit of information for future hazard/turn signal flasher needs for 2001-2003 Auroras:
There is ONE interchange for these.
2003-2007 Cadillac CTS.
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Post by AuroraGirlFromMars on Nov 1, 2022 6:51:08 GMT -6
i would buy a new switch, and without disassembling your column, unhook the harness on the column and plug a new switch in. test. If it works, you know then you need to pull your airbag, get the wheel off, pull the shrouds, and then probably a few torx or allen screws Id think to fasten to the column lol.
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Post by Greg K on Nov 2, 2022 0:01:51 GMT -6
That's exactly my plan. Pop in a flasher before I dismantle the steering wheel/column. I went to a pick n pull yard today that had two Cadillac CTS, but both of them had been gutted like a fish under the dash. No flasher to be had. But I have my 1997 Aurora to drive while I'm playing the waiting game.
It HAS to be the flasher. When I turn the turn lever to left, the flasher clicks at normal speed, identical to right turn signal which works. So the lever is obviously sending power on to the flasher. That's my theory.
Thanks so much for your help, Greg
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